In the last 3 decades the pace of changes in commercial aviation grew significantly. Emerging economies, commercial aviation deregulation and globalization all contributed to today's frenzy of dealings in commercial aviation. New companies are set up and bankruptcies filed daily. Aircraft change hands often. Rzjets database is entirely "crowd sourced" and is indeed incomplete and contains eroneous information. Finding the missing and correcting the incorrect data is part of the fun. Following is the list of sources that are used.